THE 2MASS WIDE-FIELD T DWARF SEARCH. II. DISCOVERY OF
... We present the discovery of three new southern hemisphere T dwarfs identified in the Two Micron All Sky Survey. These objects, 2MASS 03486022, 2MASS 05160445, and 2MASS 22284310, have classifications T7, T5.5, and T6.5, respectively. Using linear absolute magnitude/spectral type relations derived f ...
... We present the discovery of three new southern hemisphere T dwarfs identified in the Two Micron All Sky Survey. These objects, 2MASS 03486022, 2MASS 05160445, and 2MASS 22284310, have classifications T7, T5.5, and T6.5, respectively. Using linear absolute magnitude/spectral type relations derived f ...
CoRoT III programme
... CoRoT has made many “premières” in both planet detection and stellar microvariability. For instance CoRoT has discovered the first member of the new class of planets: Super-Earths orbiting very close to their parent star. It has also discovered the first two brown dwarfs at short orbital period and ...
... CoRoT has made many “premières” in both planet detection and stellar microvariability. For instance CoRoT has discovered the first member of the new class of planets: Super-Earths orbiting very close to their parent star. It has also discovered the first two brown dwarfs at short orbital period and ...
Unfolding the Milky Way bulge - International Max Planck Research
... points adopted as the minimum number of stars in each subfield. . . . . . . . . . 53 VVV coverage of the Bulge in Galactic coordinates. Each small square shows the coverage by individual 1◦ × 1.5◦ tile from the VVV. Tile numbering for the VVV survey is described in Saito et al. (2012) and the coordi ...
... points adopted as the minimum number of stars in each subfield. . . . . . . . . . 53 VVV coverage of the Bulge in Galactic coordinates. Each small square shows the coverage by individual 1◦ × 1.5◦ tile from the VVV. Tile numbering for the VVV survey is described in Saito et al. (2012) and the coordi ...
my dissertation (PhD. Thesis) - Argelander
... of all sizes and distances ranging from our “backyard”, namely the Milky Way itself and the Local Group to galaxies at a redshift of z ' 11 and higher. Each approach can deliver different information and has its advantages and disadvantages. In the following, I briefly describe what can be learned b ...
... of all sizes and distances ranging from our “backyard”, namely the Milky Way itself and the Local Group to galaxies at a redshift of z ' 11 and higher. Each approach can deliver different information and has its advantages and disadvantages. In the following, I briefly describe what can be learned b ...
A spectroscopic study of detached binary systems using precise radial velocities
... A complete understanding of a binary system’s orbital characteristics, as well as the measurement of the all-important stellar masses, is almost always only achieved after the binary system has been studied using two or more complementary observing techniques. Two of the suitable techniques are astr ...
... A complete understanding of a binary system’s orbital characteristics, as well as the measurement of the all-important stellar masses, is almost always only achieved after the binary system has been studied using two or more complementary observing techniques. Two of the suitable techniques are astr ...
La Sapienza – 2015
... In 1992 Aleksander Wolszczan and Dale Frail used this method to discover planets around the pulsar PSR 1257+12. Their discovery was quickly confirmed, making it the first confirmation of planets outside our Solar System. ...
... In 1992 Aleksander Wolszczan and Dale Frail used this method to discover planets around the pulsar PSR 1257+12. Their discovery was quickly confirmed, making it the first confirmation of planets outside our Solar System. ...
Absolute Flux Calibration
... Flux Calibrators: Satellites • Pro: - They are quite compact (hence better for extended configurations and/or higher frequencies than planets) and still sufficiently bright (>500mJy@3mm) ...
... Flux Calibrators: Satellites • Pro: - They are quite compact (hence better for extended configurations and/or higher frequencies than planets) and still sufficiently bright (>500mJy@3mm) ...
Search For Gas Giants Around Late-m Dwarfs - STARS
... We carried out a near-infrared radial velocity search for Jupiter-mass planets around 36 late M dwarfs. This survey was the first of its kind undertaken to monitor radial velocity variability of these faint dwarfs. For this unique survey we employed the 10-m Keck II on Mauna Kea in Hawaii. With a re ...
... We carried out a near-infrared radial velocity search for Jupiter-mass planets around 36 late M dwarfs. This survey was the first of its kind undertaken to monitor radial velocity variability of these faint dwarfs. For this unique survey we employed the 10-m Keck II on Mauna Kea in Hawaii. With a re ...
Radio pulsars
... • Young pulsars have unpredictable changes in period glitches and period noise. • Millisecond pulsars have extremely stable periods. ...
... • Young pulsars have unpredictable changes in period glitches and period noise. • Millisecond pulsars have extremely stable periods. ...
Chemical Evolution of Galactic Systems
... is whether pollution from intermediate-mass stellar winds is responsible for anomalous abundances in globular cluster stars. We test this scenario by modelling the formation and chemical evolution of a globular cluster. Recently, the most detailed abundance pattern ever measured beyond the local uni ...
... is whether pollution from intermediate-mass stellar winds is responsible for anomalous abundances in globular cluster stars. We test this scenario by modelling the formation and chemical evolution of a globular cluster. Recently, the most detailed abundance pattern ever measured beyond the local uni ...
abstracts book - Instituto de Astrofísica e Ciências do Espaço
... in Cambridge, in 1985, the range of seismic data and associated science results obtained has far exceeded the expectations of the community. The continuous observation of the Sun has secured major advances in the understanding of the physics of the stellar interiors and has allowed us to build and p ...
... in Cambridge, in 1985, the range of seismic data and associated science results obtained has far exceeded the expectations of the community. The continuous observation of the Sun has secured major advances in the understanding of the physics of the stellar interiors and has allowed us to build and p ...
Clusters: age scales for stellar physics
... for young associations is the isochrone fitting for low-mass stars. However, when these two values for several clusters are compared (see Lyra et al. 2006 or Fig.1 extracted from Barrado y Navascués et al. 2011), there are significant deviations from the one-to-one relationship. In both cases, the ...
... for young associations is the isochrone fitting for low-mass stars. However, when these two values for several clusters are compared (see Lyra et al. 2006 or Fig.1 extracted from Barrado y Navascués et al. 2011), there are significant deviations from the one-to-one relationship. In both cases, the ...
New brown dwarfs and giant planets
... Photographic survey of ~12% of the sky near the SGP - 38 cool, high-velocity white dwarfs – 4 x 10^-4 stars/pc^3 - local mass density of ~3 x 10^-4 M_sun/pc^3 => could account for 3% of dark matter if they’re in the heavy halo But are they? ...
... Photographic survey of ~12% of the sky near the SGP - 38 cool, high-velocity white dwarfs – 4 x 10^-4 stars/pc^3 - local mass density of ~3 x 10^-4 M_sun/pc^3 => could account for 3% of dark matter if they’re in the heavy halo But are they? ...
We Do Not Forget Johannes Kepler Introduction
... in such a way that the geometric gures would t perfectly between them. Initially he tested this hypothesis without success, using two-dimensional plane gures such as the pentagon, the square, and the triangle. Then he returned to the Pythagorean solids, used by the ancient Greeks, who discovered ...
... in such a way that the geometric gures would t perfectly between them. Initially he tested this hypothesis without success, using two-dimensional plane gures such as the pentagon, the square, and the triangle. Then he returned to the Pythagorean solids, used by the ancient Greeks, who discovered ...
Ages of young stars
... (l) Cargile and James (2010), (m) Naylor et al. (2009), (n) derived by E. Mamajek using data from Hauck and Mermilliod (1998) and isochrones from Bertelli et al. (2009), (o) Ventura et al. (1998). ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke ...
... (l) Cargile and James (2010), (m) Naylor et al. (2009), (n) derived by E. Mamajek using data from Hauck and Mermilliod (1998) and isochrones from Bertelli et al. (2009), (o) Ventura et al. (1998). ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke ...
Ages of Young Stars
... (l) Cargile and James (2010), (m) Naylor et al. (2009), (n) derived by E. Mamajek using data from Hauck and Mermilliod (1998) and isochrones from Bertelli et al. (2009), (o) Ventura et al. (1998). ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke ...
... (l) Cargile and James (2010), (m) Naylor et al. (2009), (n) derived by E. Mamajek using data from Hauck and Mermilliod (1998) and isochrones from Bertelli et al. (2009), (o) Ventura et al. (1998). ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke ...
SPICA Yellow Book
... what kinds of host stars, in which locations in the Galaxy, are the most favourable to the formation of planets” and “Investigate the conditions for star formation and evolution”. SPICA will have a far-IR spectrometer more than an order of magnitude more sensitive than any previous facility, enablin ...
... what kinds of host stars, in which locations in the Galaxy, are the most favourable to the formation of planets” and “Investigate the conditions for star formation and evolution”. SPICA will have a far-IR spectrometer more than an order of magnitude more sensitive than any previous facility, enablin ...
Multiplicity in Early Stellar Evolution - Astronomy Group
... systems of two or more bodies is the norm at all stellar evolutionary stages. Multiple systems are widely agreed to result from the collapse and fragmentation of cloud cores, despite the inhibiting influence of magnetic fields. Surveys of class 0 protostars with millimeter interferometers have revea ...
... systems of two or more bodies is the norm at all stellar evolutionary stages. Multiple systems are widely agreed to result from the collapse and fragmentation of cloud cores, despite the inhibiting influence of magnetic fields. Surveys of class 0 protostars with millimeter interferometers have revea ...
Science Case for the Chinese Participation of TMT
... Astronomy is the oldest science where curiosities have driven its advancement since the beginning of the mankind. Every man has asked the question: How did the universe begin? Are we alone in the universe? Astonishingly, astronomers are now on the verge of answering these fundamental questions with ...
... Astronomy is the oldest science where curiosities have driven its advancement since the beginning of the mankind. Every man has asked the question: How did the universe begin? Are we alone in the universe? Astonishingly, astronomers are now on the verge of answering these fundamental questions with ...
The Ages of Stars
... arrive at an understanding of a process. Some examples include: • The formation and evolution of proto-planetary disks appear to occur in the first ∼ 100 Myr of a star’s life, with debris disks forming later. At present we can just barely limit this time-scale with the methods available, but clearly ...
... arrive at an understanding of a process. Some examples include: • The formation and evolution of proto-planetary disks appear to occur in the first ∼ 100 Myr of a star’s life, with debris disks forming later. At present we can just barely limit this time-scale with the methods available, but clearly ...
Astronomy Astrophysics - Niels Bohr Institutet
... from the latter. Kinematic selection biases are particularly pernicious in this regard. F- and G-type dwarf stars are favourite tracer populations of the history of the disk. They are relatively numerous and sufficiently long-lived to survive from the formation of the disk; their convective atmosphere ...
... from the latter. Kinematic selection biases are particularly pernicious in this regard. F- and G-type dwarf stars are favourite tracer populations of the history of the disk. They are relatively numerous and sufficiently long-lived to survive from the formation of the disk; their convective atmosphere ...
Pulsed Accretion in the Young Binary &
... closer can drive density waves of sufficient amplitude to cause enhanced accretion onto the central star, resulting in initially massive disks being reduced to relatively low fractional levels over the course of 10 Myr or less. Accretion would also be enhanced by a smaller binary separation and a sm ...
... closer can drive density waves of sufficient amplitude to cause enhanced accretion onto the central star, resulting in initially massive disks being reduced to relatively low fractional levels over the course of 10 Myr or less. Accretion would also be enhanced by a smaller binary separation and a sm ...
2 Justification and benefits in joining TMT
... Astronomy is the oldest science where curiosities have driven its advancement since the beginning of the mankind. Every man has asked the question: How did the universe begin? Are we alone in the universe? Astonishingly, astronomers are now on the verge of answering these fundamental questions with ...
... Astronomy is the oldest science where curiosities have driven its advancement since the beginning of the mankind. Every man has asked the question: How did the universe begin? Are we alone in the universe? Astonishingly, astronomers are now on the verge of answering these fundamental questions with ...
Planetary system
A planetary system is a set of gravitationally bound non-stellar objects in orbit around a star or star system. Generally speaking, systems with one or more planets constitute a planetary system, although such systems may also consist of bodies such as dwarf planets, asteroids, natural satellites, meteoroids, comets, planetesimals and circumstellar disks. The Sun together with its planetary system, which includes Earth, is known as the Solar System. The term exoplanetary system is sometimes used in reference to other planetary systems.A total of 1968 exoplanets (in 1248 planetary systems, including 490 multiple planetary systems) have been identified as of 1 October 2015.Of particular interest to astrobiology is the habitable zone of planetary systems where planets could have surface liquid water.